Heavy duty caliper



FIG. 1 is a top, right perspective view of a heavy duty caliper showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a head on view thereof; and,

FIG. 7 is a rear end view thereof. 

CLAIM The ornamental design for a heavy duty caliper, as shown and described. 